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Compact rectangular 300W DC 12V AT power supply module with 24-pin ATX and SATA cables, black PCB, silver capacitors

myVolts

myVolts 300W DC 12V AT Power Supply Module

SKU CH-BQ4T-7SZ54

A 300 W AT power module that converts 12 V DC input into ATX power for mini-ITX and 1U cases, with over-current and short-circuit protection

  • Product typeAT
  • Delivers 300W from a 12V DC source
  • Over-current and short-circuit protection keeps components safe
  • 85% efficiency reduces heat in tight builds
  • Compact 154 x 35 x 15mm board fits mini-ITX and 1U cases
  • Includes 24-pin ATX, AUX and SATA cables for direct connection

Compact AT Power Module for 12V Systems

The myVolts 300W module converts a 12V DC source into standard ATX voltages for compact builds. It includes a 24-pin ATX cable, a 20-pin adapter, AUX power and SATA leads so drives and motherboards connect directly. Industrial solid capacitors support operation up to 55°C. The board measures 154 by 35 by 15mm and fits mini-ITX or 1U enclosures.

Suited for Embedded and Thin Clients.

This unit suits integrators powering MINI computers, HTPC appliances, POS terminals, digital set-top boxes, network servers, AD machines, bank terminals or mining rigs from a 12V rail. It does not suit builders who need an AC-input PSU with its own mains cord or who require ATX-form-factor mounting holes. The design expects an external adapter capable of 25A at 11.4 to 12.6V.

12V DC Input with 25A Peak Demand Decides

The module draws up to 25A from a 12V DC source between 11.4 and 12.6V to deliver 300W at 85% efficiency. If the external adapter cannot sustain that current, the system will not start or will shut down under load. Verify the adapter rating before purchase.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $41.99
Cheaper than about 92% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

How do I install the myVolts 300W AT module in a mini-ITX case using the 24-pin ATX cable?

Mount the 154 x 35 x 15 mm board in the case, plug the 24-pin cable into the motherboard, connect the DC input cable to a 12 V source capable of 25 A, and add the AUX cable if the board needs it; the step often missed is verifying the external adapter delivers 11.4–12.6 V at 25 A before powering on.

What maintenance will the industrial solid capacitors on this 300W AT module need over time?

The solid capacitors are rated for long life at up to 55 °C operating temperature; keep intake areas dust-free so the module stays within its 0–55 °C range and no scheduled capacitor replacement is required.

What limit appears first when the myVolts 300W AT supply runs at full load continuously?

At 300 W output the 12 V DC input draws up to 25 A, so the external adapter’s current limit or its thermal protection will trip before the module’s own 85 % efficiency or over-current protection activates.

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